They sell limited korean items but you can definitely get basic Korean ingredients and household items.

The store is located at Al Jazeera road. Best landmark would be the corner of Red Lobster restaurant in C-Ring (the road that leads to the Ramada (now Radisson Blu) Hotel and Casa del Gelato. From C-Ring (facing Hamad Hospital) turn right to the corner of Red Lobster. Go straight and you’ll see the Korean Food Center on the 4th Street (right side).